A defiant Rick Santorum dismissed calls to drop out and predicted he'll win the next contest in his home state of Pennsylvania on April 24. A look at what Santorum faces as the race heads to his backyard.

Rick Santorum came surprisingly close to an upset in Tuesday's Wisconsin primary, losing to Mitt Romney by less than 5 percentage points. It was not as heartbreakingly close as his previous losses in Michigan and Ohio, but it was one more reminder of what might have been.

His wins Tuesday in Washington, D.C., Maryland and — most importantly — in Wisconsin has produced a subtle shift in the way Republican presidential contender Mitt Romney is being referred to by the news media.

Roughly half the delegates to the GOP nominating convention have now been chosen, and Mitt Romney has emerged as the prohibitive favorite — eager to lead the party against President Obama. So how does he use the next five months until the convention begins?

With little prospect of victory in any of the three primaries held Tuesday, former U.S. Senator Rick Santorum went home to Pennsylvania. He vowed to make a last stand in his fight for the Republican presidential nomination.

The Defense Of Marriage Act prohibits the federal government from recognizing same-sex marriages — and that means Social Security benefits don't pass on to surviving partners. A lawsuit seeks the same benefits given to heterosexual married couples.

Maryland businessman John Delaney got the Democratic nod in Maryland's contentious 6th district, and he will face incumbent Rep. Roscoe Bartlett (R), who won the GOP primary in the recently redrawn district.

When you give to WAMU, your tax-deductible membership gift helps make possible award-winning programs such as Morning Edition, All Things Considered, The Diane Rehm Show, The Kojo Nnamdi Show, and other favorites.